Find and remove unused code
Finding unused code in Ruby might be difficult. Yet, there are some projects that try to do the job. I recently found https://github.com/joshuaclayton/unused and used a separate Digital Ocean droplet do process GitLab CE.
Apparently it found around 500 methods that are likely to be unused. I suppose that half of that are false negatives (for example because of the code that is being used in Enterprise Edition), but still this is interesting.
Report generated by unused
attached.